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Canon RF 10-20mm f/4 L IS STM Lens

Canon RF 10-20mm f/4 L IS STM Lens

Product Code: 1242502L

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The Canon RF 10-20mm f/4L IS STM is a portable ultra wide zoom, which captures superb image quality and features a constant aperture, 5-stop image stabilisation and STM autofocus for the first time on an L-series lens.


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We Love

  • Capture dramatic perspectives from a highly portable ultra wide zoom that features a rectilinear design to maintain straight lines
  • High-quality optics render high resolution, with minimal chromatic aberration and crystal clear details, right into the corners
  • Built-in IS provides up to 6-stops image stabilisation when combined with camera body IBIS for handheld shooting in low light
  • New STM technology introduced for fast, near silent AF, which is available on an L-series lens for the first time
  • L-series quality supports fieldwork with a weather sealed design, high quality optical coatings and customisable controls
Reasons to buy from Park Cameras

Canon RF 10-20mm f/4 L IS STM Lens Summary

With an ultra wide angle zoom range, portable design and superb image quality, the Canon RF 10-20mm f/4 L IS STM Lens is designed primarily for landscape, architecture, interiors and filmmaking. It joins the range of Canon mirrorless lenses with premium L-series characteristics, which are combined with a lightweight design weighing 570g for excellent portability in the field.

Canon has developed this compact zoom to provide confident autofocus, delivered by a stepping motor, which is available for the first time on an L-series lens. STM technology is optimised for linear focusing, which is ideal for both photography and video recording, as it is able to deliver smooth AF in near silence.

Along with competent AF, the RF 10-20mm f/4L includes a peripheral control image stabiliser capable of reducing camera shake by 5-stops, which rises to 6-stops with an IBIS-equipped EOS R mirrorless camera. Many Canon bodies offer this capability, from high-end models like the R3 and R5, through mid-range hybrid cameras such as the R6 mark II, as well as the APS-C format R7 and beyond.

An advanced optical formula is responsible for rendering high image quality with razor sharp results, which is achieved by a combination of UD and Super UD glass. This is complemented by a rectilinear optical design to keep lines straight right across the frame, which is especially useful for architectural and interior photography.

Additionally the Canon RF 10-20mm f/4 L IS STM Lens benefits from full-time manual focusing for pinpoint accuracy, a rear gel filter holder, and a customisable control ring and custom button for efficient workflows.

Key Canon RF 10-20mm Lens Features

  • Ultra wide zoom with a rectilinear design that maintains straight lines
  • 5-stop image stabiliser, rising to 6-stops when combined with camera IBIS
  • New STM autofocus for the first time in an L-series lens
  • Razor sharp results from advanced optics
  • Lens coatings minimise ghosting and flare
  • Full-time manual focus override
  • Constant f/4 aperture throughout the zoom range
  • Dust and moisture resistant design
  • Rear gel filter holder
  • Customisable button and control ring
  • Weighs just 570g
  • Read more in our Canon RF 10-20mm lens review

Canon RF 10-20mm f/4 L IS STM Lens in More Detail

Ultra wide angle zoom lens for EOS R

With a zoom range of 10-20mm this is wider than the comparable RF 15-35mm F/2.8L IS USM and RF 14-35mm f/4L IS USM Lens, enabling you to expand your view and get more into each frame. This can help you add dramatic perspectives to anything from epic scenery and sweeping vistas, to cityscapes, buildings, interiors and for movies.


Sample interior shot with the R5 and RF 10-20mm lens @14mm. Camera settings: 1/200 sec. f/4.5. ISO 3200

Image stabiliser

Canon is renowned for designing equipment which allows you to shoot handheld in low light and the RF 10-20mm lens continues this through 6-stops of combined image stabilisation, or 5-stops when shooting with a non-IBIS camera body.

The lightweight 570g design supports handholding too, with a compact size which is easy to walk with while recording video, or snap stills as you explore locations. In fact the RF 10-20mm f/4L IS STM Lens is 610g lighter and 2cm smaller that the equivalent EF 11-24mm F/4L USM DSLR lens, and includes IS, which is testament to the benefits of the RF mount.


Sample image beach boardwalk with the R5 and RF 10-20mm lens @20mm. Camera settings: 1/200 sec. f/. ISO 320

Rectilinear optics

Rectilinear optics help to keep straight lines straight right across the frame when shooting subjects such as architecture and interiors. This will appeal to photographers who want to reduce editing time and maintain high image quality into the corners without cropping or losing resolution.

STM autofocus

Canon has introduced their efficient STM (stepping motor) technology for the first time in a mirrorless L-series lens. The new STM design features a position sensor for faster start-up times, and delivers near-silent AF with high-speed accuracy for stills, and smooth transitions for video.

The STM addition is made possible by the optical design, which includes a lightweight focus group.


Sample image - Across the river with the R5 and RF 10-20mm lens @20mm. Camera settings: 1/200 sec. f/. ISO 250

Superb image quality

Subjects for which the RF 10-20mm lens is suited demand high image quality and more often than not are captured using high resolution camera sensors. To meet these demands Canon has utilised 3 glass moulded aspherical lens elements (GMo), as well as 3 UD (ultra low dispersion) and 1 Super UD glass.

This combination of special elements renders high resolution with sharp details from the centre to the edges, as well as reducing chromatic aberrations throughout the zoom range. Colours are captured with vivid results showing minimal colour blurring or dispersion, while advanced lens coatings are used to minimise ghosting and flare, ensuring you come away with impeccable results in challenging lighting conditions.

Built for professional workflows

L-series lenses offer Canon’s highest build quality and the RF 10-20mm f/4 L IS STM is designed to withstand the elements, as well as offering customisation to enhance your shooting experience. A function button and control ring can be customised for instinctive operation, and to support fieldwork the lens benefits from dust and moisture sealing.


Sample sunstar with the R5 and RF 10-20mm lens @20mm. Camera settings: 1/200 sec. f/. ISO 200

What’s in the box

  • Canon RF 10-20mm f/4 L IS STM Lens
  • Lens Dust Cap RF
  • Lens Cap 10-20
  • Lens Case LP 1219
  • User Manual
Offers: Price Drop
Offer Category: N/A
Offer Product Type: N/A
Autofocus: N/A
Aperture ring: N/A
Constant Aperture: Yes
Lens CIPA Image stabilization rating: N/A
Colour: N/A
Diameter (mm): N/A
Length (mm): N/A
Weight (g): N/A
Distance scale: N/A
DoF scale: N/A
Elements: N/A
Environmental Sealing: N/A
Focus distance limiter: N/A
Focal length: 10-20 mm
Focus method: N/A
Filter Thread: N/A
Full time manual: N/A
Groups: N/A
Hood supplied: N/A
Lens Image stabilization: N/A
Lens mount: N/A
Lens Materials: N/A
Maximum focal length: 20
Maximum magnification: N/A
Maximum aperture (number): N/A
Maximum aperture (text): N/A
Max Format size: N/A
Minimum focal length: 10
Lens Minimum focus distance (m): N/A
Minimum aperture (number): N/A
Minimum aperture (text): N/A
Motor type: N/A
Number of diaphragm blades: N/A
Power zoom: N/A
Special elements / coatings: N/A
Tripod collar: N/A
Lens type: N/A
Wide/Tele: N/A
Lens Level: N/A
Best For: N/A
Best For Holiday and Landscape: Yes
Best For Interior and Architecture: Yes
Best For Fashion and Portrait: N/A
Best For Macro and Still Life: N/A
Best For Astro: N/A
Best For Street: Yes
Best For Wildlife and Sport: N/A
Zoom lock: N/A
Zoom method: N/A
Notes: N/A

Thinking of choosing finance?

Finance is a great way to spread the cost of your purchase. To make it easy We have teamed up with Omni, one of the UK’s leading finance specialists, so that you can apply for and complete a loan application quickly, easily and informatively.

Omni Capital Retail Finance Ltd which is a credit provider/ lender regulated by the Financial Conduct Authority whose finance options are best suited for you and your purchase.

Simply add the items you love to your basket. Once you are at the checkout select the finance option that suits you and choose Omni. The quick application form is simple and should take no more than a couple of minutes to complete and you will receive a decision instantly. Easy!

Use our finance calculator to check the impact of various loan values, terms and interest rates on the total amount you need to pay and the monthly repayments.

Representative example:

Buy a £1,200.00 camera and pay a 10% deposit of £120. You'll borrow £1,080 over 24 months with an annual interest rate of 17.9% (fixed) and monthly repayments of £53.18. The total amount payable will be £1,396.33 17.9% APR Representative.

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Check your eligibility

To be considered for finance, you will need to meet all of the following criteria:

  • Are at least 18 years old
  • Are in regular full or part-time employment (minimum 1 hour per week or £10,000 income per annum), unless you are retired and receiving a private or company pension, or you are in receipt of disability living allowance
  • Are a permanent UK resident and have lived in the UK for at least 3 years
  • Have a UK bank account capable of accepting Direct Debits
  • Have a good credit history with no late payments, Debt Relief Orders, County Court Judgments or bankruptcies.
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Please note that, due to calculations, your monthly repayment may differ very slightly from what you were expecting. Please check your monthly repayment figure before proceeding

Missed or late payments will result in fees and additional interest on your loan and can also affect your credit file and your ability to obtain credit in the future.

Credit is subject to status, UK only, 18+

Park Cameras Limited is a credit broker, not a lender and is authorised and regulated by the Financial Conduct Authority (FRN 680161). We do not charge you for credit broking services. We will introduce you exclusively to finance products provided by Omni Capital Retail Finance Ltd.

Omni Capital Retail Finance Ltd which is a credit provider/ lender regulated by the Financial Conduct Authority, Firm Reference Number: 720279. For more information please go to or visit

Find out more about paying with finance here and Omni Capital Retail Finance Ltd terms here

Looking to sell your Canon RF 10-20mm f/4 L IS STM Lens?

Our Verdict

Thanks to a combination of advanced features and high image performance the Canon RF 10-20mm f/4 L IS STM Lens is a well-rounded ultra wide angle zoom, which can be used for a variety of applications. It features a lightweight design, which is considerably smaller and more portable than its DSLR equivalent, despite the inclusion of powerful image stabilisation for photographers and filmmakers who shoot handheld.

Optical performance is extremely good due to the number of special glass elements, which are arranged to capture excellent results throughout the zoom range, and across the entire frame. This is important for the intended subject matter such as landscapes and architecture, where resolution and quality are critical, and the RF 10-20mm f/4 lens is able to deliver premium results with ease.

Canon has reinvented their stepping motor for the RF 10-20mm, which includes new STM technology that is faster and more agile than its predecessor. This benefits many stills situations, and is of particular interest for filmmaking, which warrants fast and silent AF during every scene.

Aside from these characteristics, the 10-20mm f/4 L IS STM offers a range of benefits to advanced creators, such as a rear gel filter holder, customisation for faster workflows and competent weather sealing. If you shoot suitable subject matter this could be the ultimate ultra wide angle zoom lens, which you’ve no doubt been waiting for patiently until today.

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Condition guide

Our used products are subject to wear and tear in comparison to brand new products. This also applies to accessories that are supplied with the camera including batteries which may have a lower optimum performance level/life expectancy.

  • Like New – The equipment is in a condition as if you have just bought it from the manufacturer. The item is still considered to be ‘Like New’ even without the original packaging and accessories. The product has been fully tested and is in perfect working order. Lenses are optically clear. There may be light dust present that will not effect the imagery.
  • Excellent – The equipment should be close to being ‘Like New’ but there may be some small cosmetic blemishes that lower its grade. The product has been fully tested and is in perfect excellent order.
    • Cameras – Should have no marks on the LCD screen
    • Lenses – Should have no marks on the elements and optically clear. There may be light dust present that will not effect the imagery.
  • Very Good – The equipment may have some slight cosmetic wear to the paintwork and cosmetic blemishes  with only light signs of use and the product has been fully tested and is in great working order.
    • Cameras – The LCD screen may have small signs of wear that does not affect its display
    • Lenses – The mount of the lens will start to show signs of wear
  • Good – The equipment is showing more obvious signs of cosmetic wear and blemishes, but the product has been fully tested and is in great working order.
    • Cameras – LCD screen may have scratches or wear that is starting to affect the display.
    • Lenses – May have slight dust inside that does not affect images. The mount shows signs of use.
  • Well Used – The equipment will show significant signs of wear. The paintwork will be coming away in large areas exposing the metal work, but the product has been fully tested and is in great working order.
    • Cameras – LCD screen is heavily worn either by de-lamination or has scratches to it. Rubber grips are starting to come away from the body.
    • Lenses – The lens has dust inside that may affect images. The rubber zoom/focus ring is coming away from the barrel of the lens.

*All of our used items are listed with the accesories that are included. If they are not listed then they will not be supplied at eh epoint of purchase.

Used team

Peace of mind with our 6 month warranty

This product has been thoroughly tested by our team of photographers and we are happy to give a 6 month warranty as a result. The number of tests depends on the individual product but we are confident in this product having tested all the major functions. Anything that isn’t as you would expect, we then make a note of and show this in the condition notes on the page.

So you can be confident you are buying a great piece of kit that’s been looked after by a fellow photographer and seen many extraordinary sights, tested by our team of photographers and now looking forward to being set free to capture more great images!

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